A disc device has a plurality of arms configured to support the outer rim of a disc carryable. The invention uses digital certificates. RRAM memory cells can be formed at respective intersections of the signal input lines and signal output lines. A surface of the second electrode facing the organic electro-luminescence film is the second reflection surface except for the light transmission parts. The control pulse signal generator successively generates a sequence of control pulse signals in accordance with the selected set of pulse data.